Signal level correction circuit for a video signal

Details Signal level correction circuit for a video signal Signal level correction circuit for a video signal

1990-12-18

1992-08-25

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 32, 358171, H04N 518

Patent

active

051423545

ABSTRACT:
A signal level correction circuit for a video signal includes a voltage control amplifier for amplifying a video signal received from a solid state image sensor with different gains for the respective chrominance signals, a first clamp circuit for setting a black level in the video signal received from the amplifier, a comparator for outputting a voltage proportional to the difference between a peak holding voltage of a capacitor in the horizontal blanking period of the video signal clamped by the first clamp circuit, and a reference voltage. An adder adds the output voltage from the comparator and the video signal from the first clamp circuit. A second clamp circuit resets the black level of the amplified video signal. A .gamma. correction circuit adjusts the .gamma. value of the video signal from the second clamp circuit. A clipping circuit clips the dynamic ranges between the white and black level of the .gamma. value corrected video signal. A third clamp circuit resets the black level of the video signal from the clipping circuit. An A/D converter converts the analog video signal into a digital signal.

REFERENCES:
patent: 3308235 (1967-03-01), Greiner et al.
patent: 4701786 (1987-10-01), Yamanaka
patent: 4811101 (1989-03-01), Yagi

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